Staff: Mentor

It means that what looks to a 'stationary' observer as an electric field only looks to a moving observer as a combination of electric and magnetic fields. I guess I just restated exactly what it said lol What part of it dont you understand?

Staff: Mentor

Yes. The problem is that I wanted to relate this question to my initial question which was why a movin charge produces both B and E fields whole static charge produce only E field. Can someone help me?

Does it help if I tell you that Electric and Magnetic fields are not two separate things but just different aspects of one thing (Sometimes we call it the Electromagnetic Field)?

What we call a Magnetic field is how this 'thing' appears to us when we are moving fast. What we call an Electric field is how it looks when we are standing still. If we only move slowly, it looks like a mixture of the two.

The 'thing' got two names because nobody realised at first it was the same.

Staff: Mentor

Here's an example illustrating that electric and magnetic fields are two aspects of one thing, as special relativity has taught us: http://galileo.phys.virginia.edu/classes/252/rel_el_mag.html" [Broken]